Question

在我的应用中，我在内存问题上有一点问题我的编码技巧还不足以完善我的代码使用内存四次，我真的需要我怎样才能改变我的编码？

我的代码是

-(void)viewDidAppear:(BOOL)animated
{ 
UIScrollView * ScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height-88)];// 44(UpperNavigtionBar),-88(Upper+Lower)
ScrollView.pagingEnabled = YES;

// Create a UIImage to hold Info.png
UIImage *image1 = [UIImage imageNamed:@"Image-001.jpg"];
UIImage *image2 = [UIImage imageNamed:@"Image-002.jpg"];
UIImage *image3 = [UIImage imageNamed:@"Image-003.jpg"];
UIImage *image4 = [UIImage imageNamed:@"Image-004.jpg"];
UIImage *image5 = [UIImage imageNamed:@"Image-005.jpg"];
UIImage *image6 = [UIImage imageNamed:@"Image-006.jpg"];
UIImage *image7 = [UIImage imageNamed:@"Image-007.jpg"];
UIImage *image8 = [UIImage imageNamed:@"Image-008.jpg"];
UIImage *image9 = [UIImage imageNamed:@"Image-009.jpg"];
UIImage *image10 = [UIImage imageNamed:@"Image-010.jpg"];
UIImage *image11 = [UIImage imageNamed:@"Image-011.jpg"];
UIImage *image12 = [UIImage imageNamed:@"Image-012.jpg"];
UIImage *image13 = [UIImage imageNamed:@"Image-013.jpg"];

NSArray *images = [[NSArray alloc] initWithObjects:image1,image2,image3,image4,image5,image6,image7,image8,image9,image10,image11,image12,image13,nil];


NSInteger numberOfViews = 13;
for (int i = 0; i < numberOfViews; i++)
{
    CGFloat xOrigin = i * self.view.frame.size.width;

    UIImageView * ImageView = [[UIImageView alloc] initWithFrame:CGRectMake(xOrigin, 0, self.view.frame.size.width, self.view.frame.size.height-88)]; // -88(Upper+Lower)
    [ImageView setImage:[images objectAtIndex:i]];

    [ScrollView addSubview:ImageView];
}    
ScrollView.contentSize = CGSizeMake(self.view.frame.size.width*numberOfViews, self.view.frame.size.height-88); // -88(for adding Image View as subview)
[self.view addSubview:ScrollView];
}

Answer 1

您可以采取一些措施来限制内存使用量。首先，您应该使用图像的名称填充数组，而不是图像本身。鉴于您的图像的命名方式，您应该能够循环执行此操作。其次，当你加载图像时，使用imageWithContentsOfFile：而不是imageNamed：。后一种方法缓存图像，而前者则不缓存。如果您使用imageNamed：由于缓存，滚动图像（即使是延迟加载）时内存使用量将继续增长 - 在某些时候系统应该清除缓存，这应该可以防止应用程序崩溃，但我不会我认为它会使系统保持关闭设备后台的其他程序。

如何将图像名称添加到数组中？

1 个答案: